Almost finished, any last touches?

OK so I finally am about done with my not to bad home studio( not trying to make it perfect). So i Bought Alesis MultiMix Usb mixer, G5 OSX Mac. Got a pair of monitors. Drum kit mics, cabels, ect. Any thing that i should be looking further into. mabye aprogram better than Garageband? Or a compressor?. Head Phone amp?

I use SX3, I have garageband, but have only played with it a little it seems a bit toyish. However I think that one of the limited versions of Cubase or some other program would be worth checking out. After that maybe some Mic Pres or such.

I heard Heard Pro tools is great from my Audio Recording teacher. But to use pro tools dont you need something like a digi design Recording unit? What program would you guys recomend if you could pick one?

Is the digi001 just basically a 2 channel mixer with usb and comes with Pro Tools?

The digi 002 is a little outa my price range at the moment, but im tryin to do what every one is...get the best sound for the cheapest price. I understand with what i got is not gonna be studio quality but how much more will it improve it, is it worth the 400 bux or whatever for a digi001?